H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint
A vulnerability in the /3/ParseSetup endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ai.h2o:h2o-core | >= 3.30.0.7, <= 3.46.0.1 | no fix |
| Python (PyPI) | h2o | >= 3.30.0.7, <= 3.46.0.1 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-10550
- https://github.com/h2oai/h2o-3
- https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseSetupHandler.java#L121
- https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6
- https://pypi.org/project/h2o
- https://github.com/advisories/GHSA-7qq7-pvm9-x8rf
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1333- Platform
- Java / Kotlin (Maven), Python (PyPI)
- Package
ai.h2o:h2o-core, h2o- Disclosed
- 20.03.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7qq7-pvm9-x8rf - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-1440 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: ai.h2o:h2o-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 15
- First → latest
- 11.2023 04.2026
- Without a fix
- 13
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 8
- Medium 1
Disclosures per year
- 2023: 1
- 2024: 2
- 2025: 10
- 2026: 2
-
H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint this entry
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